Telephone system



Oct- 27 1925.

w. w. CARPENTER TELEPHONE SYS TEM Filud Aug. 31, 1923 MAR INA I fiwen/ar: jig re If. Car ml.

Patented Oct. 27, 1925.

UNITED STATES WARREN W. CARPENTER, 0F QUEENS,

PA'rEs'r oFFIcE,

NEW YORK, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N.

Y., A CORPORATION OF NEW YORK.

TELEPHONE SYSTEM.

Application filed August 31, 1923. Serial No. 660,805.

To all whom it may concern:

Be it known that I, WVAnRnN WV; CAR- PENTER, a citizen of the United States of America, residing at Queens, in the county of Queens and State of New vented certain new and useful Improvements in Telephone Systems, of which the following is a full, clear, concise, and exact dcscription.

This invent-ion relates to telephone systems and particularly to machine switching arrangements for automatically connecting calling lines to directively controlled apparatus such as selector and connector switches.

The object of the invention is to produce a line switch arrangement which through the use of common testing and controlling app-a ratus will be simple, easily maintained, accurate in operation and of low first cost.

A feature of the invention is the use of a common testing and controlling means and a marker or multi-contact relay device for temporarily associating such means with the particular section of a line switching device containing a calling line. In accordance with this feature a plurality of groups of line switching devices each containing a group of permanently paired primary and secondary contact devices further divided into groups of contact devices for connecting lines to links and contact devices for connecting links to trunks is provided with a niulti-contact relay arrangement automatically and selectively operated to associate a section containing a calling line with a common means to test the links and to testthe trunks and then to cause the calling line to be extended through an idle link to an idle trunk.

The drawing comprising a single sheet diagrammatically illustrates the preferred circuit arrangement embodying this invention.

ll hen the subscriber at station 1 removes his receiver from the hook circuit is complcted through the winding of line relay 2i and the loop of the substation set and line York, have inwhich results in the energization of this relay. A circuit is thereupon established from ground, the armature and back contact of relay 5, the inner right-hand armature and back contactof relay 6, the left-hand armature and back contact of group relay18, the

outer right-hand armature. and back contact of group relay 7, the back contact and lefthand arn'iature of group relay 19, the lefthand winding of group relay, the armature and back contact of trafllc register 9, the front contact and armature of line relay 21, the back contact and armature of line relay 23, winding of line vertical magnet 16, left hand winding of vertical group relay 17, back contact and outer right hand armature of relay 20 to battery and ground. Horizontal group relay 8 becomes energized in this circuit, but vertical group relay 17 and magnet 16 being marginal do not become energized at present. The energization of horizontal group relay 8 results in the establishment of a locking circuit for relay 8, from ground, armature and back contact of relay 5, winding of relay 6, inner right-hand armature and back contact of relay 7, imier right-hand armature and front contact and right-hand winding of horizontal group relay 8, to battery and ground, whereupon relay 6 becomesenergized and relay 8 remains energized. The energization of relay 6 by re moving the ground from the back contact of its inner right hand armature prevents the operation of any other horizontal group relay such as 7.

Group relay 6 now controls the succeeding back contact of relay 5, the inner right-hand armature and front contact of relay 6, the front contact and outer right-hand armature of relay 6, winding of relay 36 to battery and ground. Relay 36 becomes energized and establishes a locking circuit for relay 19 extending from ground, front contact and armature of relay 36, the inner right-hand armature and front contact of relay 19, the right-hand winding of relay 19 to battery and ground.

- Second-Upon the energization of relay 6 a circuit is established from ground, the armature and back contact of relay 5, the middle left-hand armature and front contact of relay 6, the back contact and armature of relay 25, winding of relay 26 to bat tery and ground. Relay 26 now connects the windings of relays 28 and 38 to the sleeve conductors of their associated trunks so that the busy condition of these trunks will be tested. Let us assume that the trunk 39 is busy. Then a ground will be found on the third conductor which will be extended through the front contact and inner lefthand armature of relay 26, winding of relay 38 to battery and ground. Relay will thereupon lock up in a circuit from ground, the front contact and outer left-hand armature of relay (3, the inner lower armature and front contact of relay 38, the winding of relay 38 to battery and ground. Relay 38 opens the circuit of its associated trunk vertical magnet 42.

ThirdUpon the energization of relay a circuit is established from ground, the armature and back contact of relay 5, the middle left-hand armature and front contact of relay 6, the outer left-hand armature and front contact of relay 8, winding of magnet 27 to battery and ground. Magnet 27 becomes operated and causes the interengagement of the multiple contact sets controlled thereby. The horizontal links in the group serving the calling line are now connected to the windings of relays 31 and 40, so that an idle one may be selected. Let us suppose that the uppermost link is busy. This condition will be denoted by ground on the third wire which will now be extended through the contacts controlled by magnet 27, the back contact and armature of relay 25, winding of relay 40 to battery and ground, so that relay 40 will become energized. Relay a0 is then looked up through a circuit from ground, the front contact and outermost left-hand armature of relay 6, the lefthand armature and front contact of relay it), winding of relay -10 to battery and ground.

Fourth-The energization of relay 6 also results in the energization of the vertical group relay. Since the left-hand winding of group relay 8 is short circuited the current flowing through the circuit contri'illed, by-thc line relay is increased to the point where relay 17 becomes operated.

As a result of the energization of relay 2t and magnet 27, a circuit is closed from ground, outer left hand armature and front contact of relay 26, contacts controlled by magnet 27, winding of relay 20 to battery and ground.

As a result of the energization of relays 20 and 17, three circuits are now simultaneously closed as follows:

FirstA circuit is closed from ground, armature and back contact of relay 5, front contact and outer left-hand armature of relay 20, front contact and outer left-hand armature of relay 17, the upper armature and back contact of relay 28, winding of trunk vertical magnet 29 to battery and ground. Simultaneously therewith the lefthand winding of vertical group relay 17 is short-circuited so that line vertical. magnet 16 is now included in a direct con nection from ground to battery as follows: from ground, armature and back contact of relay 5, inner left-hand armature and front contact of relay 6, inner left-hand armature and front contact of relay 8, armature and back contact of traffic register 9, front contact and armature of line relay 21, back contact and armature of line relay 23, winding of line vertical magnet 16, front contact and inner left-hand armature of relay 17, front contact and outer right-hand. armature of relay 20.

The energization of relay 20 also results in a circuitfrom ground, armature and back contact of relay 5, front contact and inner right-hand armature of relay 20, windings of relays 30 and 25 in series to battery and ground. These relays become energized and cause the deenergization of relay 26 through the opening of its circuit at the left-hand armature of relay 25. Upon the deenergixaation of relay 26 a ground is extended from the outer left-hand armature and back contact of relay 26, the front contact and up per armature of trunk vertical magnet 29, third conductor of the seized trunk to mark this trunk as busy until the succeeding operations have taken place.

Through the operation of the trunk vertical magnet 29 and the line vertical magnet 16, a circuit is closed for the horizontal magnet 32 which may be traced from ground, the armature and back contact of relay 5, the front contact and outer left-hand armature of relay 20, the armature and front contact of line vertical InagnetlG, the front contact and lower armature-of trunk vertical magnet 29, the right-hand armature and back contact of relay 51, corresponding contacts controlled by m: net 27, the righthand winding of horizontal magnet 32 to battery and ground. Through the cooperation of magnets 16, 29 and the contact sets 38 and 34; are operated so that the calling line is now extended to the trunk 35 whereupon a line relay in the succeeding circuits will be energized to return a ground on the third conductor in the usual manner. Such ground will be extended through the left and right-hand windings of magnet 32 in series to maintain this magnet energized throughout the conversation. This ground is also extended to the cut-off relay 11 of the calling line whereupon this relay becomes energized and opens the circuit of the line relay 21.

In parallel with the horizontal magnet a circuit isestablished for the energization of relay 37 as follows: from ground, armature and back contact of relay 5, front contact and outer left-hand armature of relay 20, armature and front contact of mag net 16, front contact and lower armature of magnet 29, inner left-hand armature and front contact of relay 20, winding of relay 3?, resistance 41 to battery and ground. Relay 37 now becomes operated and through its left-hand armature places a ground on the back contact of relay 5 to substitute for the ground which is immediately taken away through the energization of relay 5 accomplished through the movement of the righthand armature of relay 37. The energization of relay 5 now causes a short circuit to be placed about the winding of relay 37 so that in a short interval relay 37 becomes deenergized. hen this happens the relay 5 also being a slow releasing relay opens the substitute ground connection supplied by relay 37 upon which the various circuits heretofore described have been dependent so that at this juncture all of-the relays and magnets with the exception of the horizontal magnet become deenergized.

Upon the ending of the conversation the ground on the sleeve conductor of trunk 35 is removed in the usual manner and the horizontal magnet 32 becoming deenergized returns the contact sets 38 and 3a to normal, whereupon the apparatus concerned in this connection is completely restored.

It will be noted that, should all the horizontal links in the section giving access to a calling line be busy, then the corresponding horizontal magnets, such as magnet 32, are operated, thus closing a series circuit for he traffic register magnet 9 which operates to record the fact that an all-links busy condition exists in this particular section of the switch. Accordingly, under this condition, a calling line cannot be extended until one of the corresponding link circuits becomes idle thus deenergizing magnet 9 to complete the circuit of the horizontal group relay 8, whereupon the calling line is extended as hereinbefore described.

For a more complete understanding of the construction and operation of switches of the type shown herein, reference is made to the patent to Goodrum and Reynolds, No, 1,515,785, issued Nov. 153, 1924i.

Wliatis claimed is:

1. In a telephone system, a line switch comprising a plurality of sections each serving a different group of lines, a testing and controlling means common to all of said sections, and a marker for temporarily associating said means with said different sections.

2. In a telephone system, a line switch arranged in a plurality of sections for serving a corresponding plurality of groups of lines, a testing and controlling means common to all of said sections and a multicontact relay device for associating said common means with said different sections.

3. In a telephone system, a line switch comprising a plurality of sections each serving a different group of lines, a-controlling means comprising testing and operating circuits common to all of said sections, a marker for associating said means with said different sections, and means to automatically and selectively operate said marker.

4:. In a telephone system, a .line switch comprising a plurality of sections each in-- eluding a different group of connecting devices, a common controlling means comprising means for testing the individual connecting devices of a group and for causing the operation of the first idle one of said devices, a marker for associating said common controlling means with said different sections, and means to automatically and selectively operate said marker.

5. In a telephone system, telephone lines, trunks, a line switch comprising a plurality of links and a plurality of sections each sect1on includmg a different group of permanently paired primary and secondary contact sets, each said group being subdivided into contact sets for connecting said lines to said links and contact sets for connecting said links to said trunks, a controlling means common to all of said sections comprising means for testing the condition of said links and said trunks and for causing the operation of contact sets for extending a line through an idle link to an idle trunk, a'marker for associating said com.- mon controlling means with said different sections, and means to automatically and selectively operate said marker.

6. In a telephone system, a plurality of groups of line switching devices, a testing and controlling means common to all of said switching devices, and a marker for associating said testing and controlling means with any one of said groups.

7. In a telephone system, a plurality of groups of line switching devices, a common controlling means con'iprising means for testing the individual switching devices of iii a group and for causing the operation of the first idle one of said devices, and a marker for associating said common control ling means to automatically and selectively operate said switching devices.

8. In a telephone system, a line switch comprising a plurality of sections each serving a di'lierent group of lines, testing and controlling means common to all of said soctions, and a marker for associating said 0 means with any of said sections while said switch is being actuated, said marker being adapted to disassociate said means from said section when said switch is com pletely actuated.

In Witness whereof, I hereunto subscribe my name this 24 day of August'A. D., 1923.

lVARREN W. CARPENTER. 

